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Re:Microsoft Ships Python Code in 1996 (2009) by blahi on Friday July 22, 2016 @02:23AM (#12142013)
What do you mean by "run on python"? Those companies use pretty much every language in existence (not quite, but you get the point, I hope).
Re:Microsoft Ships Python Code in 1996 (2009) by coldtea on Friday July 22, 2016 @06:35AM (#12142748)
The Dropbox client for one is coded in Python, and Dropbox even started their own "improved Python interpreter" project.

Or take Google for example, where Python was (still is for all I know) one of the few officially sanctioned languages: Python, C++, Java (and now Go too -- which, contrary to popular belief hasn't been some kind of exclusive language Google uses, nor has it toppled C++/Java/Python etc from their codebases).

Re:Microsoft Ships Python Code in 1996 (2009) by denfromufa on Friday July 22, 2016 @05:22AM (#12142539)
Dropbox has few million lines of Python code. Chase and Bank of America have few thousand contributors on Athena and Quartz projects.

Another big elephant is OpenStack.